diff --git a/index.d.ts b/index.d.ts
index 3ece2df..6f0d4df 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -580,6 +580,31 @@ declare global {
         ): any
     }
 
+    interface CryptoPackage {
+        /**
+         * get hex of sha256 hash
+         *
+         * @param sata string
+         *
+         * @returns hex hash
+         */
+        sha256(data: string): string
+    }
+
+    interface JsonPackage {
+        /**
+         * parse json string to json
+         * @param str json string
+         */
+        parse(str: string): any
+
+        /**
+         * stringify json string
+         * @param json json object
+         */
+        stringify(json: any): string
+    }
+
     export interface HookContext
         extends GetHookData,
             GetHookGetOnlyData,
@@ -588,6 +613,7 @@ declare global {
         request(): {
             method: string
             remoteAddr: string
+            clientIp(): string
             host: string
             url: string
             path: string
@@ -616,6 +642,8 @@ declare global {
         xml: XmlPackage
         cookie: CookiePackage
         pdf: PdfPackage
+        crypto: CryptoPackage
+        json: JsonPackage
     }
 
     export interface HookException {
diff --git a/schemas/api-config/config.json b/schemas/api-config/config.json
index 8c32c5e..a535354 100644
--- a/schemas/api-config/config.json
+++ b/schemas/api-config/config.json
@@ -20,8 +20,13 @@
             "additionalProperties": true,
             "properties": {
                 "imageUrl": {
-                    "type": "string",
-                    "description": "project's teaser image url shown in admin ui"
+                    "description": "project's teaser image url shown in admin ui",
+                    "oneOf": [
+                        { "type": "string" },
+                        {
+                            "$ref": "definitions.json#/definitions/evalObject"
+                        }
+                    ]
                 }
             }
         },